Add missing user/project name in action context

These were removed in Ife653558bfcda794e7f37086832f70b0ad7c28a4
but that breaks any actions which require this data, such as
some TripleO actions.

Closes-Bug: 1740891
Change-Id: I777b1f7c7012b735805e8585938b5ce5dec31d26

mistral/context.py

@@ -270,6 +270,8 @@ def create_action_context(execution_ctx):
         is_target=context.is_target,
         is_trust_scoped=context.is_trust_scoped,
         project_id=context.project_id,
+        project_name=context.project_name,
+        user_name=context.user_name,
         redelivered=context.redelivered,
         region_name=context.region_name,
         service_catalog=context.service_catalog,